You should read up on possums like you did on coral snakes.
Possums rarely ever get rabbies and they are actually pretty good "care givers" of the environment. Although they generally won't go after a large venomous snake, they have been known to eat small venomous snakes as well, as they are immune from most snake venoms. Biggest job though is probably taking care of ticks. They make look like filth, but they do a pretty good job of cleaning up the ground.
In my youth, I never liked them (possums) because they looked like large white ugly rats LOL
Huge difference between a possum and a rat though.
By the way, never owned either a rat or a possum as a pet